Takaya Aiba is an individual who, for 30 minutes, was rescued by his father from becoming a Radam Tekkaman and escaping Earth to defend it against invasion. Upon falling to Earth, he claimed to have lost his memories and was subsequently referred to as D-Boy. Despite being able to remain in Tekkaman form for only 30 minutes before losing control and becoming a lethal force, D-Boy chose to continue fighting even if it caused him pain. He prioritized the safety of Earth over his own well-being.